'95 was the last year for the Shadow / Sundance. They were replaced by the seriously-inferior Neon.
"Highway speeds" simply means not city driving. You're over-thinking this. The Engine Computer just wants to see a steady, non-changing voltage signal from the throttle position sensor, and high intake manifold vacuum so it knows the throttle blade is closed and at its mechanical stop, not being held open by your foot. Those are the conditions the computer looks at to know the throttle is closed and it is supposed to be in control of idle speed. At that instant, it takes the reading from the throttle position sensor and puts it in memory. From then on, any time it sees that voltage, it knows it has to control idle speed.
This relearning of minimum throttle pertains to every Chrysler product with a gas engine since the early 1980s. Most people don't even notice the problem or they're unaware they unwittingly solved the stalling / hard start problem by just driving the car. All they know is the problem went away, if they noticed it at all. I have a hill near my house where I coast down it for about 40 seconds. The off-ramp from the highway nearest me allows me to coast for up to 30 seconds, so seven seconds is really very little time.
Most mechanics will do this procedure after the battery had to be disconnected if the other service requires a test-drive. Other times they should simply inform the customer of the need to do this simple final step. It may be necessary to drive with your right foot on the accelerator pedal and your left one on the brake pedal, which is how a lot of people drive anyway.
Tuesday, October 6th, 2015 AT 6:53 PM